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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables that Subsequently Defaulted (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Modified Loans |  |  | $ 941,410 |  | $ 1,020,863 | $ 373,683
Threshold period for payment default |  |  | 60 days |  |  |
60 Days or Greater Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Modified Loans | $ 87,722 | $ 14,546 | $ 121,032 | $ 26,449 |  |
Payment Default | 86,969 | 14,129 | 123,127 | 27,672 |  |
Charge-Offs | 18,056 | 4,534 | 20,564 | 6,428 |  |
Combination - Interest Rate Reduction and Term Extension |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Modified Loans | 83,100 | 12,400 | 115,400 | 23,000 |  |
Interest Rate Reduction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Modified Loans | 4,600 | 2,100 | 5,700 | 3,400 |  |
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Modified Loans |  |  | 966,356 |  | $ 1,049,190 | $ 380,526
Private Education Loans | 60 Days or Greater Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Modified Loans | 87,722 | 14,546 | 121,032 | 26,449 |  |
Payment Default | 86,969 | 14,129 | 123,127 | 27,672 |  |
Charge-Offs | $ 18,056 | $ 4,534 | $ 20,564 | $ 6,428 |  |

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